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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3194d113d0a74d07d189d077b628343e5b668b49f2b7ddfc5f76ff41053f79f0' 
  AND token = 'D9ycKyMc8olllVbAHPivrPphK3CQmxy39QnXSbkjaEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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