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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcdb6682b9f7a7ee7e7ab6a435812d0b681dc962c2c39a8f2aabeab408b516e' 
  AND token = '8FF4l08fGnb3SJglbbZMC5UUHGoJeq6DQHA63YyHWaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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