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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794e1b13bb5e4d008ae712ec3d12bac7b80761e9474994f5a224c98167f5631a' 
  AND token = 'HY9Qq4m7CAmLfJjC3h2fowScERUCZCWnr/hMxM5mRRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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