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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d8876866e749e579bf9de0a4c354ffb91107e93ac5a6326ab1ca6b1bc26fbe' 
  AND token = 'DYAMu4Yq6PJ2AEZTuBIybqM7JyGxlLNzyk6zDYUBkT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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