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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86207b7ad2d2aec38386dceb841fa60ce88f96f3620ab8960d11315a06247df8' 
  AND token = 'OWxORu/orP+eqB8bMTWp09B/b95DEgJAhy6fylM3xfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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