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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aead95d9201cf7c4103e7892a37e85efd779e850546d7b9d9fb1101bc65cc151' 
  AND token = 'tMg1bR46uKVyu9vIaKuFKhxSlu7zwnVEMjypetfO2jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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