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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965cc3f31cba6d3233502b4af3551267651c8b19c3ae0b2ff655e8cc4af9665c' 
  AND token = '47wVdTn/WrD/F1gdPpugBFvQHFq53qU3lTlFT+xJ3nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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