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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9d4ad4fea90590ae4b0b135229a491749ce6b5d1e26e5881526354cac35af4' 
  AND token = '4AJafsdozzyl098h4Ub14znhJO4/+6RIG0nhGoTKL5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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