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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d1a1f6dbe33f2fba24421c3ca0bf7c7d36f75c7c1e2d4ceccf4e9f33367e9e' 
  AND token = '0BgmUl0tpWHo6uHbN/m8TcSvTzpohghoNMcnitTyP34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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