SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4a7045f0d1daed43ab57c2923cbd08f38753ea12830c16616e9ea90cd22515' 
  AND token = 'cqriXY7ZQzzG7sER2/v+BcwNCUlOkeIKT2Ws+b/Wu4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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