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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbeb5e10e6e8a679446176f8dcf9a882980b24e0651b290f0a921b40deff01c6' 
  AND token = 'g1iFxLwqccMt+SYZCk1IyhWsGn/MTWdtv6p59lDZ0gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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