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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bc3e1b5e67c1bdf3b9356b006e4e790e9f4c91b428a7dfd55cfd54cb5759dc' 
  AND token = 'rkqtR4pC26yyF/SmnxSlvnQ2E1PxmyEqXuadEUkUTcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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