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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27394028786a05a5b7912d34dd2988d553051ee2e0fbfcc68a33ef0de8c1d29' 
  AND token = '2HdRCBQ1XlFvbkYF7eZraq48ntibCeCVaAx5XR0Uc90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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