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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7998fb9070bd763e016802bc06c0217ca98ce0a99bf2e1efe82cb209b6660279' 
  AND token = '6dg6QWfGxw1UHebT56teBTZoIp3wtthe/seDPrZPJaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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