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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ada6c374add44434ef7ec8e76a5ed88f56f4e01f681b229992d50bd172bc9aa' 
  AND token = 'h0J4LZekfOWKppq6Otm+WmuQz/Ysq8iRWS6kZaikrD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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