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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9482c3d959dea1f9844a5362931d3dd9404ee17dbc3a02b30f14f96d3b22a2b' 
  AND token = 'kzBHT1WzyBKx67zw7m3WkbirSwbkg2wQagvrTxoDs6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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