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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c115a44307f15b5fb722548da0be1b809019fcd69a0fc4b12a0789b3024900' 
  AND token = 'QNnNCfdzsFAicjZExjl3UR4ADxlNiwL6lSKhbuXUPNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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