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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20705c6f56c1e4988fbd13926bd63dc74204f926ffea015331f82b39943b8db8' 
  AND token = 'Qtsi3ToLZKNegk1Oky6SClOzdADOm0L0NXeQn1LxlqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}