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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b19a87f4743ea3148b72be46958d86d7c871b2037904f48faebdbe22ab0e685' 
  AND token = '036bt1mLZrzoZbQ8MQCuLUjem5vdf/CcmsHB4BqN6H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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