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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d3c8e8ee9bc1d834330ae9b1a577b1dbbd02b7a214e042855ccf5eb7e62501' 
  AND token = 'Ow4g19sNCCEF6qK1/+CQktPwE6vVna39Hi6vfC83gJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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