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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc09bca88cd09f0eff4e0f553359652a2fd0ff43905295871bbd400fc31d65d' 
  AND token = '89ko/7aPdNMNOUbHOjqE3dZu1L9kCsOiAsJtyRW3Q6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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