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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31b443e8a0877013f2dfcc8788b592e42eb40af80aa84e5c9f0b3e160cc91a8' 
  AND token = 'BWA39mkkaQIkRfpADqHuL/Ei9YT+14LxwOceOL0wsDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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