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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de3420989b9e27c18de16e0da2bce3730d4d178754801d2cf9879c369a7c814' 
  AND token = 'sPV2BVSmc5PhZbJ6Grn6GP2nlcqnZD8ZKQR+9fhcPHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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