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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471c64119f9e84f660bb2a544b21df0b775e78d54d134e59163e7dce684510b5' 
  AND token = 'bGkjiG+SXpXVFYBojfRhY6E1Eht00kL34sO7R6mzkZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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