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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b8ca558e74a5f2d94d2e2fd9c02abea40a4e7a6c101a1a64ffcac28afc6be3' 
  AND token = 'LTA4yYeQo99QechajxR4RFXtKKBT7/6gTjZ70L6hK3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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