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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3135827786572555b5bc87018abd62328c839d75e3cef0e50b6f679f3696e4' 
  AND token = 'yUd4Xxm5bdXEaCeJhBDOf7sj2VXOdcv8ZO7WxbJ3j2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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