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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99189822c394aee13fafaafb3ecc4298f64cf8f7e07be3e594333fe8fdd68789' 
  AND token = '+jxna2r6AfWtZj9ZouplEqJTuz0NfjC4jVP5lowI4dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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