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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c015b7cfa6b24df2a4c745bb2a48d4b29beb925cb5c25a3425a8dc0efa816173' 
  AND token = 'aeVzpmjljTvHB0jfWvgETops06HtxMfFDg9eMRdwZZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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