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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936043322fa95f4d72e10f55d9901802ff5d3eedc04eb63a5f70b6aafaf03a67' 
  AND token = 'sC+veEKxtx2QWM4NaUlIoLmDcX59Db8zg9YTFIn0Kj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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