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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31db25a6cae938f222a50b98f573585585c25901151b9b6984416d4d648d9b0f' 
  AND token = '2fknqz4/Ztz3olm3rs1nei++/rgxaXtPuQgsyTnutWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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