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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dacbc5c6ba518ec76a8c205c5c40c3d872759a725b71befcdb09ce68ac96e5f' 
  AND token = 'BkReQ3WcFJ3v3SFCX2jeEjFncmlJRlvUk80H/eR+czU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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