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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8fc12d1600d9335fba4a324d275ebb1a5ef6414c6d8c50b68552e4ce9e3d8f' 
  AND token = 'xypXAls4sbfLynKOL/sacrmE2Ia5V2KC+7HRAb1EhFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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