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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56740c201a34e3b146f4c827868b8ce6b0fe3a0b4ce8c2ea6ff1d2818266da0' 
  AND token = '6X8zKvl1mYgQSik9OPxuKNVEB+HsiPaEtRcEqLSoXxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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