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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a527842347ef29d0339449535924756dcab4936f8b28c2fa94aec59aacdd370' 
  AND token = 'sLGXeKGhdaOn8TVtXQY4jHCgIK74B6XK82DQ4CrnXsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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