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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e63ce1d8b3327202ebf48608cfcdfc3f3a5fe58b623d0ff958ba2eeb57580a2' 
  AND token = 'NNB0uqau5Dpp6nAcEqGr8+W/eOre+vXHffKfXNvxRSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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