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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a1db49a9f347e22611f4435eb809ecff5c977ac29f72ae74cc1ae0fd6ac995' 
  AND token = '3ilaEBCC/2SFPpjaqvjfG1e6PKUbxZnhY5zJfAv3We0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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