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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5e5cf207fab66e977fc2f3c6a490a3a5e94f0fefaf20fe88895e02ddbd8089' 
  AND token = 'v4bkKcBxyRt+/ieN5pmsQ541GOSPMr0x6rL2eO8PNDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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