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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0c3973ec274d1c4ff24cae66b4fe4be8eddc49ff32bd7a19163b63c0357784' 
  AND token = 'cY7NJI+bEwllYmjZB1GVhbE4VuOeIwuprU5eNJyWq+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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