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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31f4572d707be920ee9150f3b9ba16c4af6e738952f5421bedc5bab39c1ffd3' 
  AND token = '72cigfwmDuAM+/foeCn4l/D/JTOWsXPuQE2yPTbg4+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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