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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab8c22fdf0dda12ae0bb09eeba5451959cb3c47ca0235c17a8567583b6a4c63' 
  AND token = 'BIw1umK/rO11Ql5+0baRiIsm4Wm/bxPOISJJN8BudnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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