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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1f151e5233aa8a4f6ad6dd83b3709285112379dd67cd7fb37029c370777a9a' 
  AND token = 'RRA4iu/ix+xGsya7NyfjcxHv3uwJqawr+hNZEj96D18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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