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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa338aef33dace256e86ad65c5ff624a03df25028952d12c7a286d5c5166183' 
  AND token = '5/T8+SK/GRkGx0KBiPAjp1aC5FfMwKDJDKOphXKbGUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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