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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c9aa37ed70157bbe529f73a062052090e65343e0f257d5b753bdb642484d2f' 
  AND token = '8neQz+S+oYy28kEwNXX6B8G69TT9EjyNmKGwIqxvEwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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