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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c768dc997c63319a663608406bfc8d192198ea5ef44acf15e188cbf4fe4b7b6b' 
  AND token = 'Y9c050DtD4DcFDOfJjtN+aEcm6ReACjz1jRDRIqkdFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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