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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013a806cd23c7ae6ce56ba0897063e908c3ff23a7d47e528526a4e0e172c3384' 
  AND token = 'xgny7K210jvp0g1Ek5GGSSJyRkU3trjOaDcZyfCBSVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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