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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fed71658b887a62a84448fefc6b55e84afe33fa60a03d4cb5988cd6f10ebec7' 
  AND token = 'qPq2EYtb/MZbWH2dmdnqxzZ0JOL6WsPWEfQOqQY2TRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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