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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be9023c3b906de6606e59afc2a7dd6bc375289d7c6ff67cc44b1d4ae5cea9c0' 
  AND token = 'kZC6UU0CvJHra2F3YtQOazDnp6/tmLtsIlP7OLc+MI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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