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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6261664192c6887de551bd7bea79ea3ee91e44eafb7882e44a53588d645415a' 
  AND token = 'Y1vso5SQtWeNtNaNG3V3Wjl8+Zob1zT4dry4t+onfv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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