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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1558b1403a14a48ac7b49678d92a4ce8134f24a1cdd8f375555e1f56e13b22fd' 
  AND token = '3Ax/PNoUMRIRvlUPro8XvYcuC8cK4Du8tfUi907kRAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00164

JSON explain

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