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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca667eb9d5cddbf6a8bff13abc96b93f0221444bf0ed8cb98bc7a62acd8c0c25' 
  AND token = 'hH/wlse+JmLXq01rVCAHO6aSi20tYE8Bys0rOL+aXt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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