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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294398745ddc1f972499ca8a174e65ea7752de12835e10d5d862bdb225ea9e21' 
  AND token = 'yyl94vripje7hJV01bMZHtHtTiXAQTEl5kpmVkY6VSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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