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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4370dc754090cbbbff547ed367846b32aef9489159cdf8aa843203924f8846fe' 
  AND token = 'dPR7qIJ0q2BuDHc2mIjFUL+4d8Hjx86af3B3xznzp/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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